DFSReplicationGroup - update PrimaryMember to write-only but not test

CHANGELOG.md

@@ -5,6 +5,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+ - DFSReplicationGroupMembership
+   - Make PrimaryMember write-only when testing resources - fixes [Issue #58](https://github.com/dsccommunity/DFSDsc/issues/58).
+
 ## [5.1.0] - 2024-03-02
 
 ### Added

source/DSCResources/DSC_DFSReplicationGroupMembership/DSC_DFSReplicationGroupMembership.psm1

@@ -167,7 +167,7 @@ function Get-TargetResource
     .PARAMETER PrimaryMember
     Used to configure this as the Primary Member. Every folder must
     have at least one primary member for initial replication to take
-    place.
+    place. Only set during initial creation of membership.
 
     .PARAMETER DfsnPath
     Specify the DFS Namespace folder path of the membership. This value does not affect replication.
@@ -307,7 +307,7 @@ function Set-TargetResource
     .PARAMETER PrimaryMember
     Used to configure this as the Primary Member. Every folder must
     have at least one primary member for initial replication to take
-    place.
+    place. Only set during initial creation of membership.
 
     .PARAMETER DfsnPath
     Specify the DFS Namespace folder path of the membership. This value does not affect replication.
@@ -534,7 +534,10 @@ function Test-TargetResource
                     -f $GroupName,$FolderName,$ComputerName
                 ) -join '' )
 
-            $desiredConfigurationMatch = $false
+            <#
+            See https://techcommunity.microsoft.com/t5/storage-at-microsoft/the-primary-member-in-dfs-replication/ba-p/423127
+            Do not flag as a change required as flag is cleared after initial sync
+            #>
         } # if
 
         # Check the DfsnPath

source/DSCResources/DSC_DFSReplicationGroupMembership/DSC_DFSReplicationGroupMembership.schema.mof

@@ -13,7 +13,7 @@ class DSC_DFSReplicationGroupMembership : OMI_BaseResource
     [Write, Description("The local conflict and deleted path quota size in MB.")] UInt32 ConflictAndDeletedQuotaInMB;
     [Write, Description("Specify if this content path should be read only.")] Boolean ReadOnly;
     [Write, Description("Specify if a member computer deletes files and folders immediately following inbound replication.")] Boolean RemoveDeletedFiles;
-    [Write, Description("Used to configure this as the Primary Member. Every folder must have at least one primary member for initial replication to take place.")] Boolean PrimaryMember;
+    [Write, Description("Used to configure this as the Primary Member. Every folder must have at least one primary member for initial replication to take place. Only set during initial creation of membership.")] Boolean PrimaryMember;
     [Write, Description("Specify the DFS Namespace folder path of the membership. This value does not affect replication.")] String DfsnPath;
     [Write, Description("The name of the AD Domain the DFS Replication Group this replication group is in.")] String DomainName;
 };

source/DSCResources/DSC_DFSReplicationGroupMembership/README.md

@@ -5,3 +5,6 @@ usually used to set the **ContentPath** for each Replication Group folder on eac
 Member computer. It can also be used to set additional properties of the Membership.
 This resource shouldn't be used for folders where the Content Path is set in the
 DFSReplicationGroup.
+
+> Note: The PrimaryMember flag is automatically cleared by DFS once an initial
+> replication sync takes place, so is not tested by this resource.

source/DSCResources/DSC_DFSReplicationGroupMembership/en-US/DSC_DFSReplicationGroupMembership.strings.psd1

@@ -13,6 +13,6 @@ ConvertFrom-StringData @'
     ReplicationGroupMembershipConflictAndDeletedMismatchMessage = DFS Replication Group "{0}" folder "{1}" on "{2}" has incorrect ConflictAndDeletedQuotaInMB. Change required.
     ReplicationGroupMembershipReadOnlyMismatchMessage           = DFS Replication Group "{0}" folder "{1}" on "{2}" has incorrect ReadOnly. Change required.
     ReplicationGroupMembershipRemoveDeletedFilesMismatchMessage = DFS Replication Group "{0}" folder "{1}" on "{2}" has incorrect RemoveDeletedFiles. Change required.
-    ReplicationGroupMembershipPrimaryMemberMismatchMessage      = DFS Replication Group "{0}" folder "{1}" on "{2}" has incorrect PrimaryMember. Change required.
+    ReplicationGroupMembershipPrimaryMemberMismatchMessage      = DFS Replication Group "{0}" folder "{1}" on "{2}" has incorrect PrimaryMember. Ignoring as flag clears after initial sync.
     ReplicationGroupMembershipDfsnPathMismatchMessage           = DFS Replication Group "{0}" folder "{1}" on "{2}" has incorrect DfsnPath. Change required.
 '@

tests/Unit/DSC_DFSReplicationGroupMembership.Tests.ps1

@@ -541,11 +541,12 @@ try
             Context 'Replication group membership exists but has different PrimaryMember' {
                 Mock Get-DfsrMembership -MockWith { return @($mockReplicationGroupMembership) }
 
-                It 'Should return false' {
+                # Return *true* - should not flag as changed required as cleared after initial sync
+                It 'Should return true' {
                     $splat = $replicationGroupMemberships[0].Clone()
                     $splat.Remove('ConflictAndDeletedPath')
                     $splat.PrimaryMember = (-not $splat.PrimaryMember)
-                    Test-TargetResource @splat | Should -BeFalse
+                    Test-TargetResource @splat | Should -BeTrue
                 }
 
                 It 'Should call expected Mocks' {